1 kg package McCain hash browns - slightly thawed for 20 to 30 minutes in a large mixing bowl
2 cups sour cream
1 can mushroom soup
1/2 cup melted margerine
1/4 to 1/2 cup chopped onion
2 cups grated cheddar cheese
parmesan cheese for topping
Preheat oven to 350.
Mix everything together except the parmesan.
Pat into a 9x13 pan. Sprinkle the parmesan on top. Bake for 1 to 1 1/2 hours.
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